.nav-main .nav-span .nav-link {
  text-decoration: none !important;
  display: block;
  color: #1b2f32;
  width: auto;
  min-width: 140px;
  line-height: 40px;
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  padding: 0 40px;
}
.nav-main {
  z-index: 10;
  display: flex;
  top: 10px;
  position: fixed;
  width: 100%;
  min-width: 1024px;
}
.nav-main p {
  position: absolute;
  top: -7px;
  right: 50px;
  color: #828c9c;
  font-size: 30px;
}
#bg {
  width: 1000px;
  height: 1000px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  /*  水平居中 垂直居中 */
  /* background: pink; */
  transition: all 2s;
  /* 过渡尽量本身上写 谁做动画，写到谁身上 */
}
.rotate {
  transform: translate(-50%, -50%) rotateZ(-60deg) !important;
  /*  提高权重 */
}
.row1 .orb1,
.row1 .orb2 {
  position: absolute;
  width: 60px;
  height: 60px;
  top: 50%;
  left: 50%;
  margin-top: -280px;
  margin-left: -30px;
}
.row1 .orb2 {
  margin-top: -280px;
  margin-left: 500px;
}
.row1 div,
.row2 div,
.row3 div {
  /* background:-webkit-linear-gradient(起始位置, 起始颜色， 结束颜色) */
  background: -webkit-linear-gradient(top, #fff, #dedede);
  border-radius: 50%;
}
.row2 .orb1,
.row2 .orb2,
.row2 .orb3 {
  position: absolute;
  width: 200px;
  height: 200px;
  top: 50%;
  left: 50%;
  margin-top: -280px;
  margin-left: -500px;
}
.row2 .orb2 {
  margin-top: -180px;
  margin-left: 500px;
}
.row2 .orb3 {
  margin-top: 50px;
  margin-left: 0px;
}
.row3 .orb1,
.row3 .orb2 {
  position: absolute;
  width: 500px;
  height: 500px;
  top: 50%;
  left: 50%;
  margin-top: 0;
  margin-left: 0;
}
.row3 .orb2 {
  margin-top: 100px;
  margin-left: 1000px;
}
/* 动画组 */
.row1 div {
  animation: orbmove 100s linear infinite;
}
.row2 div {
  animation: orbmove 40s linear infinite;
}
.row3 div {
  animation: orbmove 80s linear infinite;
}
@keyframes orbmove {
  from {
    transform: translateX(0px) rotate(0deg);
    /* translate 相当于相对定位， 从自己现在的位置开始移动距离 */
  }
  to {
    transform: translateX(-2000px) rotate(-3600deg);
  }
}
